May 2025
Intermediate to advanced
512 pages
16h 39m
English
Content preview from Quantum Dot Display Science and Technology
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Chapter 6Quantum Dot (QD) Color Conversion for QD-Organic Light-Emitting Diode
Keunchan Oh, Hyeokjin Lee, Gakseok Lee, Taehyung Hwang
Samsung Display Co. Ltd., Large Display Process Development Team, Yongin-Si, Gyeonggi-Do, South Korea.
6.1 Introduction to Quantum Dot-Organic Light-emitting Diode
During the past 30 years, liquid crystal displays (LCDs) have dominated the global display market. They control grayscale luminance by manipulating the refractive index of liquid crystals with a given voltage [1]. However, their nonemissive nature presents inherent drawbacks. The slow response time of liquid crystals hinders the accomplishment of high quality in motion pictures. Additionally, achieving a true black state is difficult due to light leakage between polarizers caused by the pretilt angle and nonuniform alignment of liquid crystals. Furthermore, the complicated architecture, including the backlight unit, results in bulky panels, limiting the adoption of various form factors such as foldable and flexible displays. Organic light-emitting diode (OLED) displays, based on self-luminous organic materials, have successfully overcome these intrinsic limitations of LCDs [2].
Organic light-emitting diodes show a microsecond response time corresponding to excitonic recombination under applied voltage. Moreover, their perfect black state leads to a contrast ratio of 1 000 000. A simple architecture and flexibility of OLEDs enable them to achieve various shapes of display.
While OLED ...
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